Minor revisions are necessary to streamline, reduce reporting burden, and improve implementation of the National Primary Drinking Water Regulations for Lead and Copper. These changes do not affect the rule's basic requirements to optimize corrosion control and, if appropriate, treat source water, deliver public education, and replace lead service lines. EPA also is requesting comment on several burden reduction suggestions that the Agency is not proposing but believes are worth considering. Finally, EPA is collecting additional data in response to a legal challenge by the Natural Resources Defense Council on the exclusion of Transient Non-Community Water Systems (TNCWSs) from coverage under the rule and is requesting public comment on the appropriateness of the continued exclusion.